Go with 60K - I always did when I ran VW 1.9TDI diesels (and even then had an OE tensioner pully fail on me at 55K, causing the belt to shear...).
Change the water pump at the same time (if you hadn't planned to already) - seem to remember 659FBE saying the drive pulley on the water pumps are under alot of pressure on the PD engines, so a change every time is good practice. Also I'd change the auxilliary belts too, whilst you've got the front end of the car off - makes it much easier. Get ContiTech belts too > cheaper and not made in the Far East, unlike VW OE belts!
Finally, if you're planing to hold on to the car for a while, and you haven't changed it already, replaced the alternator clutch pulley - these are a known faliure point as well, and again, much eaiser to replace when the front end of the car is removed.
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